The Team Magma's Groudon EX (15 / 34) card can be found in the Double Crisis set.
Recently sold 14 times and based on those sales is worth around £28.18.
Currently, there are 20 open listings for this card on ebay.
This card sells in the range of £13.56 to £42.80, making it quite volatile.
This Rare Ultra card was illustrated by nagimiso.
The fact that it is a EX card makes it one of the more valuable cards.